Electrical relay.



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BLEGTRIGAL RELAY.

APPLICATION FILED AUG. 10, 1908.

Patented Mar. 14, 1911.

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WITNESSES: j

CHARLES 0. root,

SIGNAL COMPANY, OF ROGHESTER, NEW YORK.

ELECTRICAL RELAY.

To all whom it may concern:

Be it known that I, CHARLES 0. Poor, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Electrical Relays, of which the following is a specification.

This invention relates particularly to relays for use inconnection with electric railway signaling systems, although it is applicable to relays for other purposes. I

manner, by bending its The object of the invention is to produce a relay in which the operating parts and the contacts are securely inclosed within a casing, and are inaccessible under ordinary conditions, while the fixed contacts of the relay are so mounted that they may be removed for the purpose of cleaning them without'disturbing the other parts of the relay, and in such a manner that, when they are replaced, their adjustment with respect to the other parts of the relay is precisely the same as before.

To theabove end, the invention consists in the relay hereinafter described, and as defined in the succeeding claims.

In the drawings Figure 1 is a side elevation of a relay embodyin this invention; Fig. 2 is a section on the me 2-2 of Fig. 1; Fig. 3 is a section through a corner of the armature box of said relay; and Fig. 4 is a' much enlarged section on the line 2-2 of Fig. 1, but omitting all parts below the front contact of the rela The illustrated embodiment of my inven: tion is provided with the usual coils 1, 1. The armature 2 of the relay is pivoted with; in the armature box or casing, and carries insulating posts 4, on which is supported the contactbar 3. At one end the contact bar is connected by a flexible connection 5 with a binding, post 6, and the other end bears a contact spring 7. The movement of the contact bar 3 is determined by the adjustable back stop 8, which may also be a back contact. The back-stop is ad'usted, in the usual orizontal arm u or down. The contact spring 7 is adapte to makean electrical connection with the front contact 9, which is carried byv a binding post 10,'and extends into the'relay box in suitable juxtaposition to the contact on the armature. The armature box has glass sides 11 held by corner posts 12 and between Specification of Letters Patent.

Application filed August 10, 1908. Serial No. 447,901.

a bottom plate 13 and a top plate 14. The top plate 14 carries-the binding posts, the relay coils, and the pivotal supports for the armature, and it constitutes, therefore, a baseplate for the relay and a unitary support' by which the working parts are held firmly in operative relation.

or nocnEs'rEn, NEW vomg assmnon T0 GENERAL RAILWAY Patented Mar. 14. 1911.

In railroad work adjustment of the relay shouldnot be disturbed. Consequently, the bottom plate 13 and the top plate 14 are fastened together by screws 15 (Fig; 3), each of which passes through the top plate, through a corner post,and into the bottom plate, and has its head deeply countersunk into the top plate 14. The cavity thus formed is filled with a suitable sealing material 16, which, when it hardens or sets, firmly locks the screw in place, and is adapted to show the marks of any tampering with or opening of the box. This reduces the liability of injury to the delicate contact springs carried by the contact bar 3, and of disturbance of the adjustment of. the con tacts. v

It is well known that relay contacts require cleaning at times, in order that perfect electrical connections may be made; and in order to accomplish-this with the least disturbance of the parts, the contacts 9 and their binding posts 10 are not mounted directly upon the to plate 14 in the usual manner, but are set in a removable support. or plate 17 which fits in a socket 18 in the top plate 14 and is firmly forced into its position by securing means such as the screws 19. The plate 17 has lip portions 20 that overhang the edges" of the socket 18 and rest on the upper surface of the top plate 14, this surface constituting an abutment by which the position of the plate 17 is determined, so that the plate 17, after removal, may be replaced with the certainty that the contacts will take the exact position they had before removal.

1. A relay having, in combination, a easing provided with an aperture, an armature mounted within the casing, a movable contact actuated by the armature and inclosed within the casing, a contact-support mounted upon thecasing in position to close said aperture, a fixed contact carried by the contact-support and projecting through said aperture andinto cooperative relation with connecting the casing and the contact-support and adapted to orce the latter directly into engagement with the outer surface of the casing adjacent the aperture, said surface acting as an abutment to determine the position of the contact-support, and the con tact-support being movable directly into and out of engagement with said surface when released by the securin means.

2. A relay having, in com ination, a casing provided with an elongated a erture, an armature'mounted Within the casing, a. plurality of movable contacts actuated by the armature and inclosed within the casing, a contact-support mounted upon the cas' position to close said aperture, a plura ity of fixed contacts carried by the contact-support and projecting through said aperture and into cooperative relation with the movable contact, and securing means connecting the casing and the contact support an adapted to force the latter directly into engagement with the outer surface of the casing adjacent the aperture, said surface acting as an abutment to determine the posi tion of the contact-support, and the contact support being movable directly into and out of engagement with said surface when released by the securing means.

CHARLES O. POOR.

Witnesses:

F. L. DODGSON, E. E. PINK. 

